Improvement in center drop-l ght gasal ers



C. DEAVS.

Center D'ropLLight (asali'ers.4

Uivrrnn S'TirrnsN PATENT CFFIGE.

CHARLES DEAVS, OF NET YORK, N. Y.

IMPROVEMENT IN CENTER DROP=L'GHT GASAL'ERS.

Specification `forming part of' Letters PatentNo. 150,837, dated May l2, i874.; application filed l i May i, 1874.

To all whom it may concern:

Be it known that I, CHARLES DEAVS, of the city of New York, in the county and State of New York, have invented a new and useful Improvement in Center Drop-Light Gasaliers 5 and I do hereby declare that the following is a full, clear, and exact description thereof, referencebeinghad to the accompanying drawing, which forms a part of this specification.

This invention relates more particularly to an improvement in that class of gas chandeliers which are termed center-slide gasaliers 5 and it consists in the combi11ation,with the main stem andaspring-drum, the latter provided,

with a hollow or tubular post, for windingup its spring, of a vertically sliding drop tube arranged to pass through the said hollow winding-post, and provided with one or more ribs, or one or more grooves, to engage with one or more recesses in the said post, or with one or more pins or projections on the said post, as the case may be, whereby the said sliding tube, which is a drop-light duct, operates like a worm when drawn down or pushed up, and effects the winding up and permits the unwindin g of the spring in a stationary springdrum, thereby producing a compact, durable, and eiiicient sustaining mechanism for a center-slide droplight gasalier.

In the accompanying drawing, Figure I is a longitudinal central section of a center slide gasalier embodying my present improvement. Fig. 2 is a transverse section of the same, taken on the plane of the line x x, Fig. l. Fig. 3 is a transverse section, taken on the plane of the line y y, Fig. l; and Fig. ei is an external Vview of a portion of the drop-light tube and hollow winding-post. 1

A A designates the main stem of the alier, consisting of an outer tube, A, and an inner tube, A. B is the main distributer, secured to thelower end ofthe tubeAin the usual manner, and receiving gas` through a gasway, (one or n1ore,) a a, between the tubes A A. (See Fig. 2.) C- C are the stationary branch light ducts radiating from the said distributer. D is the drop-light tube or duct, to the lower end of which a harp 7 or other-shaped droplight is attached. It is customary to provide the lower end of this drop light tube with a small distributer,1),'whichreccives gas through the tubes A and a stationary supply-tube, c,

the latter being secured to the ceiling joint, and extending down within the drop light tube suiiicientl y far to open into it when the latter is drawn out or down to its greatest e tent, thereby furnishing a gasway for the droplight (through c and D) entirely distinct from th at (a a) which supplies the stationary branch4 arranged to extend into a longitudinal groove (one or more) made in the tube D, would answer thesame purpose, and be equivalents for the projections d d and grooves c c.

E is a spring-drum, composed of a convolute spring, f, and a case, f. (See Figs. l and 3.) This spring-drum is placed horizontally, and is secured directly or indirectly to the main stem A A. In the present instance it is secured to the bottom of the distributer B, as will be readily understood by reference to Fie'. l. This spring-drum is provided with a tubular or hollow windingpost, F, to which the inner end of the convolute spring f is attached, and around which it is wound. And through this hollow post the dropdight tubeD passes;

and it is necessary that these two parts-thc hollow winding-post F and the sliding tube D-should be so arranged and adapted to each other that the moving of the tube D shall rotate the post F, and hence wind up, and permit the unwindin g of, the spring j'. This may be accomplished by providing the tube D with one or more spiral ribs, to en gage with recesses or grooves in the post F; or by providing thc tube D with one or more spiral grooves., to en gage with pins orprojections onthe said post F.

In the drawing I have shown the tube D as provided with fourV ribs, 71J h h h; and ll have shown the hollow winding-post F as provided with a square aperture or hole, @',through it. (See Figs. 3 and 4.) Hence, when the tube D, which is prevented from turning, as before stated, is

inserted through such hole, the ribs h will rest in the corners of the square aperture t',- and, therefore, when the said tube D is drawn down or moved up, the post F will be revolved inthe stationary drum E, and the spring F will be wound up or unwound, as the case may be.

It will thus be seen 'that by providing the ordinary drop-light tube of a gasalier with spiral ribs or spiral grooves, and passing it through a hollow winding-post in a spring-drum which is provided with recesses or pins, as the case may be, and so arranging the said tube as to prevent it from rotating, it will act as a worm or screw to operate the sustaining mechanism in a gasalier.

I have shown an inclosing-case, G, for containing the sustaining mechanism, as well as the distributer; and I will here remark that, when the main distributerB is arranged farther up on the main stem, the spring-drum may be attached to the end of the said main stem, as is obvious.

From tlicforegoing description it will be seen that I produce a compact, durable, and efcient spring-sustaining mechanism for counterbalancing the drop-light and tube in a center-slide gasalier.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a gasalier, the combination, With thel spring drum E and hollow winding post F,

light tube D, passing through the said spring drum, and engaging with its windingpost F, all arranged and having a mode of operation substantially as herein specified.

CHARLES DEAVS. Witnesses:

M. M. LrvINGsToN, A. J. DE LACY. 

